Hairpin



June 1925. L. M. C HAPMAN 1,539,935

HAIRPIN Filed Dec. 6. 1923 cifg/ 6' w m M J g. h I? I I 67 l i Patented June 2, 1925.

LEO M. CHAPMAN, OF CHICAGO, ILLINOIS.

HAIRPIN.

Application filed December 6, 1923. Serial No. 673,850.

1 all whom it may concern:

Be it known that I, LEO M. CHAPMAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use ful improvements in Hairpins of which the following is a specification.

The invention relates to improvements in hair pins.

One of the general objects is to improve hair pins.

A more specific object is to provide improved means for locking the pin in place in the hair.

A further object is to provide a hair pin having two prongs normally closed which are forced open by the act of inserting it in the hair and which will automatically close and lock itself in place.

A further object is to provide a hair pin novel in form and advantageous in its use.

Other objects and advantages will readily appear from a consideration of the following description, when taken in conjunction with the drawings, wherein Fig. 1 is a side elevation of the pin.

Fig. 2 is a section on line 2-2 of Fig. 1.

Fig. 3 is an enlarged transverse section on line of Fig. 1.

Fig. l shows the pin with a double kink in both of its prongs.

Fig. 5 is a view similar to Fig. l showing the kinks extending in the opposite direction to that of Figs. 1 and t.

In all the views the same reference charactors are employed to indicate similar parts.

The pin is made of spring wire of resiliency sufficient to permit the movement of the elements to an operative extent without producing any set in the wire. Like other hair pins it is composed of two generally parallel legs or prongs and 11..

In the preferred embodiment these legs are preferably made as one integral piece and at the bend the wire is formed into a laterally enlarged loop 12, preferably in the leg 10. The object of this enlargement is to increase the latitude of movement of the legs when they are being separated, because the deflection of the wire extends over a larger surface and is not confined to the usual contracted critical zone as when the lateral loop 12 is not present. Another object of the loop 12 is to provide a receptacle for the hair when bunched at this end of the pin and, furthermore, the bunched hair in the loop 12 serves as one of the holding means at the closed end of the pin, the shoulder 13 serving as an abutment to yieldingly hold the pin in place.

The terminal end 14: of the leg 10 is straight and separated from the terminal end 15 of the leg 11, a distance substantially equal to the diameter of the loop 12. Immediately back of 14 and 15 the legs are closer together, at 16 and 17, near the open end of the pin, than they are just in front of theloop, at 13 and 18, and therefore they taper with respect to each other toward the front open end.

Just back of the end 1 1 the leg 10 is bent at an angle 19 converging towards 16, and back of 16 the leg 10 is formed into a kink, at 20. The leg 11 is also formed into a kink 21.

In Fig. 1 the kink 21 of the leg 11 is shown nesting within the kink 20 of leg 10. The positions of the kinks may, however, be reversed and the kink or kinks of leg 10 may nest in the kink or kinks of leg 11, as shown in Fig. 5.

Fig. 4 shows that the pin of Fig. 1 may contain a plurality of kinks 20, 20 21, 21 in the legs in nesting relation. The nesting kinks, near the open end of the pin, retard its axial movement in either direction and serve to hold it in place unless intentionally moved in applying or withdrawing the pin.

lVhen inserting the hair in the pin by axial movement of the pin, the spread of the nds 1 1 and 15, as shown will cause a relatively large bunch of hair to be contained in the gap therebetween. The converging inclined portion 19 will cause the legs to separate to permit the pin to move inwardly past the lock provided by the kinks 20 and 21. Further movement of the pin will cause a bunch of hair to enter the laterally extending loop at the closed end of the loop which serves as an additional lock. The lOcking effect is not at any time so positioned as to prevent the hair from being moved outwardly when suflicient force is applied to disengage it.

The pin will hold its place, however, with sufiicient certainty to prevent accidental dislodgment.

To give greater strength to the pin in the desired direction I prefer to flatten the wire at 22 forming a part of the boundary of the loop.

Having described my inventiuni What I, Within the qthflhand (116,163. diverging lat- 10 claim asflnewcanddesire to ,seeure by. Lette s ml yaan mbre-aptly mmiflwe inks tQWard Patent, is 2- the ()PQIL end of the pin and then bent into A hair pin having two inwardly and gradpamllelrelation,withthe other leg at the ex- 5 ually converging legs, and. a loop at the trenle open endoftl1e pin.

closed end of the pin, the larger pal-toil In testimony whereof I hereunto set my 15 which lies on one side of the longitudinal hand, axis of the pin; a kink .ineachjleg, neaizthe open end 01 the pin, one kink normally LEO M. CHAPMAN. 

